Background: We're doing a lot of project work using QGIS. These projects are based on "template"-projects for administrative units, which are always kept up to date, e.g. new WMS are added, newly downloaded data, etc. Once a project is created, we save the corresponding template to the project folder and usually add some project-specific layers. These layers are not relevant to all the other projects, hence the "separation" in order to keep the template as sleek as possible.
Problem: Sometimes datasources change. WMS get turned off, or new data becomes available, etc, pp. These changes are incorporated into the templates by us, naturally. But the already created projects also need to be updated - which can be labourous, especially if there are 50 or more projects within an administrative unit.
Question: Is there a possibility to automatically update the layers/links in these projects? Either by using the templates as reference, or by incorporating a database, or by some other means?